Method of producing paper-pulp from old paper.



' Ho D rawing.

onrrnn srnrriss mini-"since.

CARL KURTZ Heir-runner nnu'rmive-siv, GERMANY.

' MEI'HQD OF PRODUCING PAPER-PULP FRSJM 9111) PAPER.-

weenie.

To all whom it may con/cam Be it known that I, CARL Kmz'rz HZiHNLn,

' a subject of'the King of Wurttemberg, residing at lleutlingen, in-

According to lmown methods the, old. paper is first carefully out up,then treated. with the lye and. afterward'washe'd. out by j means of sprinklers, until it is clean. 1 .Witli' these methods, however, it is not possible to recover the lye, whereby the expenses of the production are rendered hi h. Furthermore a method has been me e known, in which place oi a. mechanical "disintegration of the mass to be treated an exclusively chemical disintegration is effected by means of u. con'umrutivelyton'centrsted solution of ulkoli. With this method, however, it was impossible to recover the lye as was intended, since the spongy material completely absorbed. the ire and hardly released a considerable quantity of the lye voluntarily.

lheretore with this process the maximum quantity of the alkali employed was lost. Besides this the fact is to e takenmto account, that the chemicul disintegration has a most unfuvoruble influence upon'the fibers treated.

The present invention avoids the drawbacks of the old-methods and consists i it process, in which an economical -cleani "g of the old paper is rendered possible. This effect can, however, be attained only in case the method iscurricd out exactly is here 'inufter explained and the following points or view are considered. First of ullthe connection between color or ink and paper must be so much loosened, us to render pos sible a. complete washing out of theimpurities in the subsequent process. in order to chcnpcn us much as possible the whole proccsslhc diluted solution of alkali employod' requires to be recovered after its use and to be repeatedly used over and over uguiu in the following opcrutions, so that always only the quantity of alkali lost or Specificetien of Letters Patent; .n nmucn nee December 5, 1911. Serial 1%. 863,9?9

words it should linui'ncrily treated is as follows separate from the fillets Petentetll /iay 14, 1912."

consumed inthe previous process needbe' compensated for. It is for this reason, that at the moment that the alkali is about to he recovered, the paper requires to huveessen t-ially maintained its structure, in other at this moment not yet have been turned into it pulpy mass, sinceotherwisethe'recovery of the alkali would he priion ihe'old paper so pre then requirm to undergo a most extensive mechanical disintegration, whereupon the washing of the finely divided material on sieves bymeens of sprinklers is effected. A furtheressentiehfeature of the new method consists in. that during thedisintegration suhsequent ticully impossible feet is avoided. Therefore the new method.

to the treatment with slush every ob ectionable pressing er" The old rew materials are firstasoeked with 'a diluted lye, until the connection between the paper and the color orink is snfliciently loosened, then subjected to a. light. ressure for squeezing out liquid. Ci his-is best effected by means of an endless sieve, which receives the meterisl and conveys it between several consecutive pans of lightly loaded squeezing rolls,

whereby the exceeding quantity of lye is squeezed out- The l. quid flowing oil is returned to n reservoinir. order to he sfterword restored to its initial state. The tronsmissionof the material and thereniovel of the lye may, however, slsobs eiiiected means of a tapering conveyeror aiijvxnrcilnr device. The materiel musk; roliminarily treated is then put nfo vesse cl a, con venient quentity-of water 18...!l1l31'6fi1l02fil whereupon the ineteriulisreduced tou'ilu. by means of t\v1rls 5ji:a.,1tdtio'rs, "so that taken to protect the mess-from. pressing efi'ects. Agitating epparutusefMin-inn proved construction may be employed,

which are capable of finely dividing tire-ms.-

Cull

tcrial by means of rctaryngitators or twirls.

The known apparatus called in German Gloolcenserfasere r are particularly suit.

able for this purpose. In order to tree the fibrous mass from the loosened impurities, y

it is now pieced on an endless belt offine w1re-guuze and passed therewith beneath sprinklers, so that the sprays can on the impurities. At the delivery end of tho sieve the completely cleaned fibrous mass can be taken 0 Metem ute-the alkaline, en

vii?

mjhteelnte neeesaity,

carried out continuv I Mfifljf, evmthe ,'hlrgest quantities, and A process for cleeningpaper from print time but max/ mntities of chemicals mg and writin thereon b the use of alka- I line liquids w ich may e afterward ree1 eo thnt it mm be;employe& most a covered which consists in'first soaking the m sitmemusly for all sorts of old papers, pa, er with a diluted alkaline solution, then, '%e wr mp1emof the lmvest uelityt utious menout the liquid,

agents, water and reducing the same to fibers withbe emout pressure,, and finally sprinkling said I Fam thefslection of the chemical fibrous mass with water for carrying ofi the ;a,,ggmtga it fie] always essential, that the chem impurities. 7 im ts? he, aepablejqfi producing a. sufiicient upon the papa-to be cleaned or upon gities-to be removed without alterypawermuss to a degree which examul}, "eutleyggf or wages and. drivin Emma th m, else -qther chemical Whseh :qrndugze a, annular efiect, may

I claim: I

511 jected to a light pressure for/squeezing t en mlxing the-mass with Witnesses:

Fm'rz K003, MAX GESSLER.

CARL KUBTZ HKHNLEQ l 

